<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .parent{
        display: grid;
        color: #efefef;
        width:100%;
        height: 200px;
        grid-template-columns: 1fr 1fr 1fr;
    }

    .left,
    .right,
    .center {
        box-sizing: border-box;
    }
    .center {
        background-color: #2ECC71;
    }
    .left {
        background-color: #1ABC9C;
    }
    .right {
        background-color: #3498DB;
    }

  </style>
</head>
<body>
  <!-- [css] 你知道的等高布局有多少种？写出来 -->
  <div class="layout parent">
    <div class="left"><p>left</p> </div>
    <div class="center">
        <p>我是中间部分的内容</p>
        <p>我是中间部分的内容</p>
        <p>我是中间部分的内容</p>
        <p>我是中间部分的内容</p>
    </div>
    <div class="right"><p>right</p></div>
</div>

</body>


</html>